Patrick is one of the best in the industry and continually steps up his game. I personally run his Pro Series 4150 953cfm carb on my Chevelle and it picked up 15-30+HP over similar Holley/Quickfuels, drives like a grocery getter too. I have used his carbs on numerous customer builds as well.
I know a few guys on the Chevelle forums are running the SV1 with good luck.
Pats customer service is some of the best in the industry, he give you his CELL #
